Health guidance on dietary supplements and vitamin D deficiency

As individuals increasingly turn to dietary supplements to address issues such as fatigue, sleep quality, and skin health, experts emphasize that these products should serve as temporary support for a balanced diet rather than a replacement for a healthy lifestyle.

When selecting supplements, it is important to identify specific needs—such as immunity or beauty—and prioritize ingredient quality, traceability, and bioavailability. Consulting a pharmacist is recommended to ensure safety and avoid potential drug interactions. Certain groups, including athletes, pregnant women, and vegans, may have increased nutritional requirements.

Vitamin D deficiency is another significant health concern, particularly during autumn and winter. Common symptoms include persistent fatigue, diffuse pain, and frequent infections. Because these signs are non-specific, a blood test measuring 25-hydroxyvitamin D is required for an accurate diagnosis. A prolonged deficit can lead to serious conditions such as osteomalacia, osteoporosis, and increased fracture risks. According to Inserm, a deficiency is indicated by levels below 20 ng/mL, with a confirmed deficiency occurring below 10 ng/mL.